FLN56-12D 630-20 (SF6) SF6 High Voltage Load Switch
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- Product Overview
- The FLN36-12 SF₆ Load Switch is a double-break rotary load switch that utilizes sulfur hexafluoride (SF₆) gas as both its insulation and arc-extinguishing medium. It is suitable for 10kV power distribution systems. Each switch is permanently sealed after being filled with SF₆ gas at a pressure of 0.4 bar. The switch can be installed either vertically or horizontally without restrictions. In ring main units, the typical installation method is horizontal mounting with a steel partition plate placed between the cable compartment and the busbar compartment. This installation method isolates the busbar from cable joints to meet the stringent safety requirements for operation and maintenance.
With the continuous advancement of national urban and rural power grid renovation and construction, the market demand for load switches, ring main units, compact switching stations, and prefabricated substations has been steadily increasing across the country. In response to this trend, our company initiated the research, development, and production of the FLN36-12 SF₆ Load Switch in 2000. This product features stable performance, high technical parameters, full insulation, hermetic sealing, and maintenance-free operation. Building on this foundation, we have further designed the currently most advanced top and bottom unit modules for SF₆ load switches. These modules are priced in line with national market conditions and are fully capable of replacing imported products in terms of performance.
Thanks to its numerous advantages—including simple structure, maintenance-free operation, and reasonable pricing—the SF₆ load switches manufactured by Daya Electric Group have gained wide market acceptance. Our products are used extensively in more than 30 provinces, municipalities directly under the Central Government, and autonomous regions across China (excluding Tibet and Taiwan), covering major cities such as Beijing, Shanghai, Tianjin, Chongqing, Guangzhou, Chengdu, Shenyang, Wuhan, and Xi’an, as well as provinces including Hunan, Zhejiang, Jiangsu, Shandong, and Shanxi. They have consistently received high praise from users.
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Model Designation
Indoor Service Environment
a) Ambient Temperature
Maximum temperature: +40℃Minimum temperature: -15℃
Daily average temperature: ≤35℃
Ambient HumidityDaily average relative humidity: ≤95%Monthly average relative humidity: ≤90%
Daily average vapor pressure: ≤2.2×10⁻³ MPaMonthly average vapor pressure: ≤1.8×10⁻³ MPa
b) Altitude: Not exceeding 1000 m
c) Seismic intensity: Not exceeding Grade 8
d) Service Location Requirements
No dripping water, no frosting, no condensation, no flammable or explosive hazards, no chemically corrosive gases, and no severe vibration.Structural Features
◆ The FLN36-12 Load Switch adopts a double-break, rotary moving contact structure, and has three operating states: closed, open, and grounded.
◆ The load switch uses SF₆ as the arc-extinguishing and insulating medium. It is hermetically sealed by upper and lower housings cast from epoxy resin, featuring excellent insulation performance.
◆ In the event of internal arcing, there is a structurally weak point at the rear of the housing, which will rupture. Subsequently, the arc relief flap on the top of the cabinet will open, directing overpressure gas flow to the outside of the cabinet, ensuring high safety performance.
◆ Each load switch is permanently sealed and maintenance-free for its entire service life.
◆ The relative pressure of SF₆ gas inside the load switch is 0.045 MPa.
◆ The mechanical service life of the load switch is 5,000 make-break operations and 2,000 open-ground operations.
◆ The FLN36-12 Load Switch and its operating mechanism are housed in a detachable upper module. This design allows for easy conversion between a load switch cabinet and a load switch + fuse combination cabinet.
◆ Operating Mechanism
◆ The FLN36-12 switch configured with Type K operating mechanism is referred to as the incoming line switch. It features a three-position interlock function; the main switch can be opened or closed manually or electrically, and the earthing switch can be opened or closed manually. It is equipped with mechanical position indicators for both the main switch and the earthing switch.
◆ The FLN36-12 switch configured with Type A operating mechanism is referred to as the outgoing line switch. It has a three-position interlock function; the main switch can be opened or closed manually or electrically, and can be tripped via pushbuttons or a release device. The earthing switch can be opened or closed manually. The switch is provided with mechanical position indicators for the main switch and earthing switch, as well as a mechanical indicator for fuse blowout.
Optional Components
◆ Auxiliary Contacts: 2 normally open (NO) - 2 normally closed (NC) at closed position; 2 normally open (NO) - 2 normally closed (NC) at open position; 2 normally open (NO) - 2 normally closed (NC) at grounded position
◆ Shunt Trip Coil: For Type A operating mechanism
◆ Mechanical Trip Button: For Type A operating mechanism
◆ Electric Operation: Electric opening and closing of the load switch can be achieved by equipping it with a motor drive device and a control unit
◆ The high-voltage module top unit of the load switch structurally inherits the characteristics and advantages of previous SF₆ load switch products. It replaces the cumbersome and complex technical and service work caused by supplying separate components such as the switch body, operating mechanism and interlocking parts under the old mode. The design fundamentally takes into account product completeness, standardization and modularization. The top unit is an integrated assembly consisting of the FLN-type load switch, Type A/K operating mechanism, basic interlocking and tripping devices, as well as fixed steel plate frame and panel, with all functions fully pre-adjusted. This ensures installation standardization and overall safety for operators and equipment operation. In the event of internal arcing caused by excessive current due to line faults, a structurally weak point at the rear of the housing will rupture. Subsequently, the arc relief flap on the top of the cabinet will open, directing overpressure gas flow to the outside of the cabinet.
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